In the One Piece series, there are several characters who are considered to be extremely powerful and could potentially pose a challenge to Goku from the Dragon Ball series. Here are five of the strongest One Piece characters that could potentially challenge Goku (Not saying they can defeat goku or not) :
Kaido, the Emperor of the Sea, is one of the Four Emperors and is known to be one of the strongest pirates in the world. He has survived numerous battles, including falling from a sky island, and is considered to be virtually indestructible.
- Big Mom, another Emperor of the Sea, is a powerful pirate with the ability to manipulate souls. She is also known to have incredible strength and durability, and has survived numerous battles and injuries.
Whitebeard, also known as the "Strongest Man in the World," was a former Emperor of the Sea and was known for his immense strength and ability to create earthquakes with his Devil Fruit ability. He was able to defeat several other powerful pirates during his lifetime.
Shanks, one of the Four Emperors and the captain of the Red Hair Pirates, is known for his immense strength and combat abilities. He is also a skilled tactician and has a strong sense of loyalty to his crew and allies.
Monkey D. Dragon, the leader of the Revolutionary Army and the father of the main protagonist, Monkey D. Luffy, is considered to be one of the strongest characters in the series. He has a bounty of over 1 billion berries and is known for his immense strength, speed, and tactical prowess.
It is worth noting that these rankings are subjective and based on the abilities and power levels of the characters as they are presented in the One Piece series.